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synchronization

Syntax



synchronization {
signal-type (t1 | e1);
switching-mode (revertive | non-revertive);
y-cable-line-termination;
transmitter-enable;
validation-interval seconds;
primary (external-a | external-b);
secondary (external-a | external-b);
}

Hierarchy Level



[edit chassis]

Release Information

Statement introduced in JUNOS Release 7.6.

Statement introduced on the M120 router in JUNOS Release 9.3.

Description

Juniper Networks M320, M40e, and M120 routing platforms support an external synchronization interface that can be configured to synchronize the internal Stratum 3 clock to an external source, and then synchronize the chassis interface clock to that source.

Options

signal-type—Specify the line encoding mode for interfaces: either t1 or e1. For the M40e router, only the t1 signal-type mode is supported.
switching-mode—Specify revertive if a lower-priority synchronization can be switched to a valid, higher-priority synchronization.
y-cable-line-termination—(M320 routers only) Specify that a single signal be wired to both Control Boards (CBs) using a Y-cable.
transmitter-enable— (M320 routers only) Control whether the diagnostic timing signal is transmitted.
validation-interval—Validate the synchronized deviation. If revertive switching is enabled and a higher-priority clock is validated, the clock module is directed to the higher-priority clock, and all configured and active synchronizations are validated. The validation timer resumes after the current validation interval expires.
primary—First external timing source specified in the configuration hierarchy.
secondary—Second external timing source specified in the configuration hierarchy.

Usage Guidelines

See Configuring an External Synchronization Interface.

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.

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